My friend have an Asus Rampage Extreme (775 socket) and it started to get "VGA BIOS" error on the LCD Poster. He is running an Sappire 4870x2. I started by swapping it with an AMD 5450 or something similar single slot GPU that doesn't need additional power. The problem went away and then I reinstall the old 4870x2 with a new Antec 520W and the problem came back. Am I looking at a dead GPU or is it not sitting properly? Also, he's old Zelman PSU seem a bit broken because when I turn off the PSU switch, there's still power going to the motherboard as all the onboard LEDs are still on.

EDIT: When I manage to boot into Windows, there were a lot of GPU related errors in Event Logs and he complained about BSOD as well.

Well I fixed it. I read on another link that it could be not sitting in the slot properly. Since I had to force the card up a bit to align it with the case screw holds, I suspected it may be out alignment despite it's all the way into the slot. I unscrewed it and it booted right the way. Unfortunately, I removed it since I couldn't trust that Zelman PSU as it would pass power the motherboard even with the back power switch set to off.